Email domain security is a cell security setting that enables you to restrict membership in the cell to those with a verified email address from a given email domain.
An email domain is the string of text that follows the '@' in your email address. For example, if your email address is:
Then your email domain would be:
Because Alice has a subdomain of 'sales', both the main domain, 'xyzcompany.com', and the full domain, 'sales.xyzcompany.com', are valid. This means that Alice can join any cell with domain security set to either one of these domains. Alice can also set email domain security on any of their cells to either of these two options.